Strange problem

Hello all I have this code it works fine on both my computers but my when my friend trys to run my game it has a problem and would crash if not for the try catch code. This is the code that my log file is pointing to being the problem although I am not sure if it is that or something else. Any ideas on what might be going wrong would be appreciated.

taken from source.cpp function ini()

Code:

try
	  {
		for(int z=0;z<256;z++)
		{
			int alpha = z;
			for(int y=0;y<256;y++)
			{
				for(int x=0;x<256;x++)
				{
					MyLightMap[x][y][z] = ((x*alpha)+((y*(255-alpha))))/256;
				}
			}
			if(z%3 == 0)  //some graphics for the loading process
			{
				count++;
				int ncount = count*1.171875;
				char LOADTEXT[16] = "LOADING... ###%";// using 11 12 13
				LOADTEXT[11] = '0' + ncount/100;
				LOADTEXT[12] = '0' + (ncount%100)/10;
				LOADTEXT[13] = '0' + ncount%10;
				blit(LAYOUT,BUFFER,0,0,0,0,scrx,scry);
				try  //in case font didnt load properly
				{
					textout(BUFFER,big_font,LOADTEXT,scrx/2,scry/2,makecol(z,z,z));
				}
				catch(...)
				{
					textout(BUFFER,font,LOADTEXT,scrx/2,scry/2,makecol(z,z,z));
				}
				blit(BUFFER,screen,0,0,0,0,scrx,scry);
			}
		}
		if(DEBUGMODE)DEBUG<<"Blend Mode Enabled OK"<<endl;
	  }
	  catch(...)
	  {
		if(DEBUGMODE)DEBUG<<"Blend Mode Encountered a problem and was unable to initalize."<<endl;
		DRAW_LIGHTS = false;
	  }

To see for yourself you can download the program and support files at ftp://24.0.62.164/
Also keep in mind that it does work on my computers but not on his.
Use at your own risk etc etc. It is about 5 megs so it might take a little while.

edit: the game crashes later on still on his comp but I think if I can see what is wrong here I can fix it in the other spots.